QUINCLORAC

Common name: Quinclorac

Chemical name: 3,7-dichloro-8-quinolinecarboxylic acid

Structural formula:

Chemical class: Quinolinecarboxylic acid herbicide

CAS No.: 84087-01-4

Properties: Technical product is light gray powder. M.p. 274 ℃ . V.p. ﹤ 0.01 mPa (20 ℃ ). Soluble in water 0.065mg/kg (pH 7, 20 ℃ ). In ethanol, acetone 2 (both in g/kg, 20 ℃ ). Stable to heat and light and between pH 3 to 9.

Toxicity: Acute oral LD 50 for rats 2680, mice ﹥ 5000 mg/kg. Acute percutaneous LD 50 for rats ﹥ 2000 mg/kg. Non-irritating to eyes and skin (rabbits). Inhalational LC 50 (4 h) for rats ﹥ 5.2 mg/L.

Ecotoxicology: Birds, acute oral LD 50 for mallard ducks and quail ﹥ 2000 mg/kg. In 8-day feeding trials, LD 50 for mallard ducks was ﹥ 5000 mg/kg. Fish, LC 50 (96 h) for rainbow trout, bluegill sunfish, carp, and minnow were all ﹥ 100 mg/L. Bees, non-toxic by contact or ingestion. Daphnia, LC 50 (48 h) 113 mg/L.

Environmental fate: Animals, more than 90% of radiolabelled quinclorac administered orally to rats is excreted in the urine within 5 days. Plants, in plants, systematically translocated to the roots and to the leaves. Soil/Environment, only slightly absorbed by the soil. Depending on soil type and organic matter content, the chemical is relatively mobile, this mobility increasing with higher percolation rates in fields. Quinclorac is degraded by micro-organisms, 3-chloro-8-quinolinecarboxylic acid being a major metabolite. Water regimes causing changes in moisture content in rice soils enhance the microbial degradation. Photolytic decomoposition in active paddy water occurs in the presence of sunlight and dissolved humic acids.

Treatment: Antidote: unknown.

    Get medical aid. Eyes, skin, flush with plenty of water. Ingestion, do NOT induce vomiting unless advised by a physician.

Mode of action: Rapidly absorbed through the foliage. Weak auxin activity as determined in wheat coleoptile elongation test, cucumber root elongation test, cucumber curvature test and ethylene biosynthesis test in soya beans. No influence on Hill reaction. Plant response is similar to IAA or auxin-type herbicides of the class of benzoic acids and pyridine compounds.

Usage: In transplanted, seeded rice for control of Aeschynomene, Echinochloa, Ipomoea, sesbania, etc. Postemergent in spring wheat for Setaria and in turf for Digitaria sanguinalis, trifolium, etc. Postemergent chem. Fallow application for control of convolvulus arvensis.